Thread: Writing a clock...

Alright, so, after messing around with Dev-C++, I've managed to come up with a simple clock:

Code:

#include <iostream>
#include <windows.h>

using namespace std;

int main()
{
    unsigned short int hours = 0;
    unsigned short int minutes = 0;
    unsigned short int seconds = 0;
    unsigned short int exit = 0;
    string input;
    
    cout<<"Display seconds?\nY/N: ";
    cin>>input;
    cin.ignore();
    
    cout<<"\n\nPlease set the time (hours)\nTime: ";
    cin>>hours;
    cin.ignore();
    
    cout<<"\n\nPlease set the time (minutes)\nTime: ";
    cin>>minutes;
    cin.ignore();
    
    while (exit == 0)
    {
          system("cls");
          
          if (input == "y")
          {
                      if (minutes < 10)
                      {
                                if (seconds < 10)
                                {
                                            cout<<"\n\nCurrent time: "<<hours<<":0"<<minutes<<":0"<<seconds;
                                }
                                
                                else
                                {
                                            cout<<"\n\nCurrent time: "<<hours<<":0"<<minutes<<":"<<seconds;
                                }
                      }
                      
                      else
                      {
                                if (seconds < 10)
                                {
                                            cout<<"\n\nCurrent time: "<<hours<<":"<<minutes<<":0"<<seconds;
                                }
                                
                                else
                                {
                                            cout<<"\n\nCurrent time: "<<hours<<":"<<minutes<<":"<<seconds;
                                }
                      }
                      if (seconds >= 60)
                      {
                                minutes++;
                                seconds = 0;
                      }
                      
                      if (minutes >= 60)
                      {
                                hours++;
                                minutes = 0;
                                seconds = 0;
                      }
                      if (hours >= 13)
                      {
                                hours = 1;
                                minutes = 0;
                                seconds = 0;
                      }
                      
                      seconds++;
                      Sleep (1000);
                      
          }
          
                    if (input == "n")
          {
                    
                      if (minutes < 10)
                      {
                                  cout<<"\n\nCurrent time: "<<hours<<":0"<<minutes;
                      }
                      
                      else
                      {

                                  cout<<"\n\nCurrent time: "<<hours<<":"<<minutes;
                      }
                      
                      if (seconds >= 60)
                      {
                                minutes++;
                                seconds = 0;
                      }
                      
                      if (minutes >= 60)
                      {
                                hours++;
                                minutes = 0;
                                seconds = 0;
                      }
                      if (hours >= 13)
                      {
                                hours = 1;
                                minutes = 0;
                                seconds = 0;
                      }
                      
                      seconds++;
                      Sleep (1000);
          }
    }
    return 0;
}

So, it works all fine and dandy, but I'd like to know what could be improved.
(also, is it possible to preformat integers to show 01 instead of 1?)

And yes, I'm definitely not very far along, but writing simple applications amuses me :P

What I'm asking is what would somebody more experienced do differently to achieve the same purpose?